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Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Summary of Nonvested Shares Related To Long-Term Incentive Plan) (Details) - $ / shares
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Weighted-average Fair Value per Unit at Grant Date    
Closing common share price   $ 43.23
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Three-year risk-free rate 1.31%  
Volatility rate, minimum 15.00%  
Volatility rate, maximum 20.00%  
Share Units    
Share Units, Nonvested as of beginning of year 1,024,870  
Share Units, Granted [1] 584,312  
Share Units, Forfeitures (15,949)  
Share Units, Vested [2] (10,754)  
Share Units, Nonvested as of Current period end 1,582,479  
Weighted-average Fair Value per Unit at Grant Date    
Weighted-average Fair Value per Unit, Nonvested as of Beginning of year $ 46.08  
Weighted-average Fair Value per Unit, Grants [1] 44.13  
Weighted-average Fair Value per Unit, Forfeitures 45.07  
Weighted-average Fair Value per Unit, Vested [2] 43.44  
Weighted-average Fair Value per Unit, Nonvested as of Current period end $ 45.39  
Performance period 3 years  
Risk free interest rate period 3 years  
[1] Performance share units granted to certain executive and nonexecutive officers and other eligible employees under the 2014 Incentive Plan.
[2] (b)Performance share units vested due to the attainment of retirement eligibility by certain employees. Actual shares issued for retirement-eligible employees will vary depending on actual performance over the three-year measurement period.